To all intents and purposes, perspective and point of view are synonyms in OP's sentence - just as intents and purposes are in this one.
It's just a style of writing that doesn't add any core meaning, but many of us do it quite often for various reasons. Ignoring pointless waffle and writers paid by the word trying to increase their income, there are two main reasons.
In some cases, the 'repetition' is intended to amplify or underline. In mine, to convey that I definitely meant all intents and purposes (plus I just wanted an example).
OP's example seems to be didactic (it's part of a 'teaching' text). The repetition here is probably because the writer is concerned in case his audience aren't familiar with the somewhat metaphoric use of 'perspective'. Adding or point of view simply defines the preceding term to make sure there's no misunderstanding, and perhaps it may teach a new usage.